33. AULAcocEPHALus. 17;^ 



haemal spine. The pubic boue is as feeble as the ventral fin itself"; 

 it is composed on each side of two narrow laminae, forming together 

 a channel. 



All the teeth form rather broad \-illiform bands ; in both the jaws 

 they extend to the posteiior extremity of the bone ; those of the 

 vomer are arranged in a triangular patch with emarginatc hinder side. 



2. Rhypticus arenatus. 

 Cuv. Sf Val. iii. p. (J5. pi. 45. 



One continuous dorsal. Greyish brown, punctulated with bro^vn. 

 Coast of Brazil ; Jamaica. 



rt. Half-grown. Jamaica. From Dr. Parnell's Collection. 

 h, c. Half-grown : skins. Trinidad. Presented by J. B. Richardson 

 Esq. 



3. Rhypticus maculatus. 



Holbr. Ichthyol. S. Carol, p. 39. pi. G. f. 2. 



r>. 2 I 25. A. ^. C£ec. pylor. 4. 



The two dorsal spines separated from the soft portion. Olive- 

 brown with whitish spots. {Holhr.) 

 Cape Romaia (coast of S. Carolina). 



4. Rhypticus bicolor. 



Smecticus bicolor, Valenc. I. c. p. 307. pi. 2. f. 2. 



D. 10 I 21. A. ^. 



Crimson, marbled with lighter ; all the fins black. 

 Galapagos Archipelago. 



33. AULACOCEPHALUS. 



Aulacocephalus, Teni7n. Sf Schhy. Faitn. Japan, p. 15. 



Seven branchiostcgals. AH the teeth villiform ; without canines ; 

 palatines ? ; tongue ?. One dorsal, with nine spines, the anal fin 

 with three. Operculum with thi-ee points ; preeopereulum strongly 

 serrated at the lower limb. Scales small. 



Indian Ocean. 



1. Aulacocephalus schlegelii, 



Aulacocepbalus, .sp., Faun. Japan, p. 15. pi. 5. f. 2. 

 D. f. A.^. 



13 ■'^" 10 



The height of the body is 3| in the total length, the length of the 

 head is more than one-thii-d of it. Sub- and interoperculum den- 

 ticulated ; suprascapula pointed. Tiolct ; on each side of the back 



